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1 A - 4
1977 PONTIAC SERVICE MANUAL
TEMPERATURE LEVER POSITION WILL
REGULATE OUTLET AIR TEMPERATURE
BY BLENDING THE INCOMING OUTSIDE
AIR THRUIAROUND THE HEATER CORE.
MOVING THlS "AIR-FAN"
LEVER DOWN FROM "OFF"
/
ALLOWS OUTSIDE AIR TO
ENTERHEATERCASE-
FURTHER DOWNWARD
MOVEMENT OF LEVER
ALLOWS SELECTION OF
FAN SPEEDS.
1
POSITION OF THlS "DEFROST"
LEVER DETERMINES AIR
FLOW FROM FLOOR OR
WINDSHIELD OUTLETS-IN
"OFF," FLOW IS ABOUT 80%
TO FLOOR & 20% TO WIND-
SHIELD. IN "DEF," FLOW
IS REVERSED. ANY POSITION
BETWEEN "OFF-DEF" DIVIDES
%ACCORDINGLY.
FIG. 1A-4 1 9 7 7 X SERIES HEATER CONTROL
THIS
SYSTEM
ER DETERMINES
FROM
UNDER
PANEL, FLOOR OR
OUTLETS-THIS
THlS POSITION ALLOWS ABOUT
THlS POSITION A L
FAN SWITCH HAS NO "OFF"
TEMPERATURE LEVER POSlTlON
POSITION-WILL
RUN ON "LO"
WILL REGULATE OUTLET AIR
SPEED WHEN SYSTEM SELECTOR
TEMPERATURE
BY
BLENDIM
LEVER IS MOVED TO "OFF" AS
THE
INCOMING OUTSIDE A l
LONG AS IGNITION IS IN "ON"
THROUGHIAROUND THE HEATE
POSITION.
CORE.
FIG. 1A-5 1 9 7 7 ASTRE AND SUNBIRD HEATER CONTROL
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